Groombridge 1618
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| Observation data Equinox J2000.0 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 11m 22.1411s |
| Declination | +49° 27′ 15.252″ |
| Apparent magnitude (V) | 6.61 |
| Characteristics | |
| Spectral type | K7V |
| U-B color index | 1.29 |
| B-V color index | 1.36 |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | -25.5 km/s |
| Proper motion (μ) | RA: -1361.55 mas/yr Dec.: -505.00 mas/yr |
| Parallax (π) | 205.81 ± 0.67 mas |
| Distance | 15.85 ± 0.05 ly (4.86 ± 0.02 pc) |
| Absolute magnitude (MV) | 8.17 |
| Details | |
| Mass | 0.64 M☉ |
| Radius | 0.50 R☉ |
| Luminosity | 0.046 L☉ |
| Temperature | 3800 K |
| Metallicity | approximately solar[1] |
| Rotation | 8.7-28.1days (.9-2.9km/s) |
| Age | 1 × 109 years |
| Other designations | |
Groombridge 1618 is a star in the constellation Ursa Major. It is located relatively close to Earth, at a distance of 15.85 light years. This is an orange main sequence dwarf of spectral type K7.0V.
It is a flare star with behavior similar to UV Ceti. The chromosphere has been shown to be active and possesses star spots comparable to a Sun spot. It has a greater luminosity than most flare stars, which are typically red dwarfs, but is less active. The level of activity may suggest that this is a somewhat youthful star.
[edit] See also
[edit] References
- ^ Woolf, V., & Wallerstein, G. 2005, "Metallicity measurements using atomic lines in M and K dwarf stars", Monthly Notices of the Royal Astronomical Society, v. 356, pp. 963-968.
Observation data from SIMBAD Query Result
[edit] External links
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